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The name of a method’s receiver should be a reflection of its identity; often a one or two letter abbreviation of its type suffices (such as “c” or “cl” for “Client”). Don’t use generic names such as “me”, “this” or “self”, identifiers typical of object-oriented languages that place more emphasis on methods as opposed to functions. The name need not be as descriptive as that of a method argument, as its role is obvious and serves no documentary purpose. It can be very short as it will appear on almost every line of every method of the type; familiarity admits brevity. Be consistent, too: if you call the receiver “c” in one method, don’t call it “cl” in another.
75 lines
2.4 KiB
Go
75 lines
2.4 KiB
Go
// Copyright 2014 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package tradingstate
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import (
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"io"
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"math/big"
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"github.com/XinFinOrg/XDPoSChain/common"
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"github.com/XinFinOrg/XDPoSChain/rlp"
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)
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// stateObject represents an Ethereum orderId which is being modified.
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//
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// The usage pattern is as follows:
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// First you need to obtain a state object.
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// tradingExchangeObject values can be accessed and modified through the object.
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// Finally, call CommitAskTrie to write the modified storage trie into a database.
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type stateOrderItem struct {
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orderBook common.Hash
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orderId common.Hash
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data OrderItem
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onDirty func(orderId common.Hash) // Callback method to mark a state object newly dirty
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}
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// empty returns whether the orderId is considered empty.
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func (s *stateOrderItem) empty() bool {
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return s.data.Quantity == nil || s.data.Quantity.Cmp(Zero) == 0
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}
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// newObject creates a state object.
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func newStateOrderItem(orderBook common.Hash, orderId common.Hash, data OrderItem, onDirty func(orderId common.Hash)) *stateOrderItem {
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return &stateOrderItem{
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orderBook: orderBook,
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orderId: orderId,
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data: data,
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onDirty: onDirty,
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}
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}
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// EncodeRLP implements rlp.Encoder.
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func (s *stateOrderItem) EncodeRLP(w io.Writer) error {
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return rlp.Encode(w, s.data)
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}
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func (s *stateOrderItem) deepCopy(onDirty func(orderId common.Hash)) *stateOrderItem {
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stateOrderList := newStateOrderItem(s.orderBook, s.orderId, s.data, onDirty)
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return stateOrderList
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}
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func (s *stateOrderItem) setVolume(volume *big.Int) {
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s.data.Quantity = volume
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if s.onDirty != nil {
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s.onDirty(s.orderId)
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s.onDirty = nil
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}
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}
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func (s *stateOrderItem) Quantity() *big.Int {
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return s.data.Quantity
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}
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